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        <p>
            <br />
            Data is filtered on a series-by-series basis. When a series is filtered, its 
            data points are either removed from the series&nbsp;or marked as empty. The points 
            that are filtered depends on the specified filtering criteria.</p>
        <p>
            Filtering criteria can be specified in several different ways:
        </p>
        <ul>
            <li>Using date/time ranges. </li>
            <li>Removing all points except for the largest or smallest points. </li>
            <li>Comparing point values against a constant. </li>
            <li>Using custom criteria.</li>
        </ul>
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